Buffer to WAV

buffertowav.js

// assuming a var named `buffer` exists and is an AudioBuffer instance


// start a new worker 
// we can't use Recorder directly, since it doesn't support what we're trying to do
var worker = new Worker('recorderWorker.js');

// initialize the new worker
worker.postMessage({
  command: 'init',
  config: {sampleRate: 44100}
});

// callback for `exportWAV`
worker.onmessage = function( e ) {
  var blob = e.data;
  // this is would be your WAV blob
};

// send the channel data from our buffer to the worker
worker.postMessage({
  command: 'record',
  buffer: [
    buffer.getChannelData(0), 
    buffer.getChannelData(1)
  ]
});

// ask the worker for a WAV
worker.postMessage({
  command: 'exportWAV',
  type: 'audio/wav'
});